RU31089U1 - Dual betatron pulse power system - Google Patents

Description

DOUBLE BETATRON PULSE SYSTEM

The utility model relates to the field of accelerator technology and is intended for the generation of high-energy electron beams for the subsequent use of accelerated electron energy for flaw detection, cancer treatment, etc.

In some cases, to determine the coordinates of defects, a stereo image is required, which requires the use of two betatrons (double betatron).

The known power systems of a double betatron in the case of mixed excitation of its electromagnets Yarushkin Yu.P. Some questions of studies of mixed excitation of electromagnets of small-sized betatrons. The dissertation, Tomsk, 1964; Ivashin V.V. Valve and valve-mechanical switching in schemes for obtaining magnetic fields in electric machines. The dissertation, Tomsk, 1968 .; Ananyev L.M., Vorobev A.A., Gorbunov V.I. Induction electron accelerator - betatron. M., Gosatomizdat, 1961. In connection with the development and implementation of pulse power systems for betatrons, Ivashin VV, Furman E.G. An experimental study of losses in the power circuit of a betatron by unipolar current pulses. Proceedings of the TPI, 1970, vol. 212, p. 134-139; Furman E.G. Power supply systems for impulse electromagnets with capacitive energy storage. - PTE, No. 5, 1988, pp. 7-27, allowing the formation of current pulses of various shapes in the inductive load, including in the windings of the betatron electromagnet, the interest in mixed excitation has disappeared. This is because when the betatron electromagnet is excited by unipolar current pulses, not only the main advantage of mixed excitation is the formation of unidirectional magnetic fluxes, but also appears

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MKP7 N05N 7/04

a number of additional benefits. For example, the weight and size parameters of the betatron electromagnet are less than with mixed excitation; the weight and size parameters of the power system are reduced. It should be noted that until his time, double betatrons with pulse power were not developed.

Known pulse power system of the betatron (in the case of a bipolar mode of operation of a capacitive storage) Auth. USSR certificate No. 661743, MKP2 NOZK5 / 01, B.I. No. 17, 1979, p. 260. To create a double betatron, it will be necessary to use two such pulse power systems, which form a double betatron pulse power system, selected as a prototype, containing a first electromagnet with a magnetic circuit and with an excitation winding, a second electromagnet with a magnetic circuit and with an excitation winding, and a capacitive storage.

This pulse power supply system of a double betatron will have to contain 8 thyristors of two oscillatory circuits and two capacitive storage. The use of such a large number of elements will lead to a significant increase in the cost and mass and size parameters of a double betatron.

The objective of the utility model is to reduce the cost and weight and size parameters of a double betatron.

The problem is achieved in that in a pulsed power supply system of a double betatron containing a first electromagnet with a magnetic circuit and with an excitation winding, a second electromagnet with a magnetic circuit and with an excitation winding, a capacitive storage device, according to a utility model, the field winding of the first electromagnet is connected to a capacitive storage through one thyristor , which through another thyristor is connected to the excitation winding of the second electromagnet, and in parallel to the excitation winding of the first

an electromagnet through the first and second thyristors of energy input is connected in series to each other, a DC power source and a choke, which through the third thyristor of energy input are connected in parallel to the field winding of the second electromagnet.

With this version of the pulse power supply system of a double betatron, instead of 8 thyristors of two oscillatory circuits, only 2 will be used, instead of two capacitive drives, one will be used.

In a betatron, a significant part of the cost of a pulsed power system is made up of the following elements - a capacitive storage and thyristors of an oscillatory circuit. These elements also make up a significant part of the overall dimensions of the pulse power system. Consequently, the resulting double betatron pulse power system will have significantly lower mass and size parameters and cost than the double betatron pulse power system, consisting of two pulse power systems considered in Auth. USSR certificate No. 661743, MKP2 NOZK5 / 01, B.I. No. 17, 1979, p. 260. This circumstance, respectively, will lead to a significant reduction in the cost and mass and size parameters of the double betatron.

Figure 1 shows the electromagnetic system of a double betatron, where the dotted line shows the position of the vacuum accelerator chambers in the polar spaces of the electromagnets.

In FIG. 2 shows a schematic diagram of a pulse power system of a double betatron.

Fig. 3 shows plots of changes in currents and voltages in a pulse power supply system of a Double betatron, where the numbers indicate:

13 - change in the current of the winding 2 of the excitation of the first electromagnet,

14 - voltage change on the capacitive storage ± barely 5,

15- change in current of the winding 4 of the excitation of the second electromagnet.

The electromagnetic system of a double betatron (Fig. 1) contains a magnetic circuit 1 of the first electromagnet, an excitation winding 2 of the first electromagnet, a magnetic circuit 3 of the second electromagnet, an excitation winding 4 of the second electromagnet.

The pulse power system of the double betatron (figure 2), includes a magnetic circuit 1 of the first electromagnet, a winding 2 of the excitation of the first electromagnet, a magnetic circuit 3 of the second electromagnet, an excitation winding 4 of the second electromagnet. The capacitive storage 5 through the thyristor 6 is connected to the excitation winding 2 of the first electromagnet, and the excitation winding 4 of the second electromagnet through the thyristor 7 is connected to the capacitive storage 5. The DC coupler 8 is connected in series with each other and the inductor 9 through the first energy input thyristor 10 and the second energy input trifistor 11 is connected in parallel to the winding 2. The winding 4 through the third energy input thyristor 12 is connected in parallel to the power source 8 and inductor 9.

At time ti, with the arrival of control pulses to the first energy input thyristor 10 and the second energy input thyristor 11 (Fig. 2) from the direct current power supply 8, inductor energy is introduced into the excitation winding 2 of the first double betatron electromagnet (Fig. 3, curve 13). At time t, after the end of energy input, the thyristor 6 is turned on, the oscillatory discharge of the capacitive storage 5 to the excitation winding 2 begins (Fig. 3, curve 14), and the thyristors 10, 11 are de-energized and turned off under the action of the voltage of the capacitive storage 5. In the first double-betatron electromagnet, magnetic fluxes are created through

the reverse magnetic circuit of the magnetic circuit 1 of the first electromagnet, in the equilibrium orbit, and the central magnetic flux. At time t / z, after the end of the acceleration process C, a decreasing part of the current pulse is formed in the excitation winding 2 (Fig. 3, curve 13). By the time U, the current in the field winding 2 becomes equal to zero, and the capacitive storage 5 is recharged to the maximum voltage with the polarity indicated in parentheses. In this case, all the energy stored in the magnetic field of the first electromagnet of the betatron, during the time interval, is recovered in the capacitive storage 5.

At time / 4, with the arrival of a control pulse to the third thyristor 12 for inputting energy from a direct current power supply 8, inductor 9 is injected with energy into the excitation winding 4 of the second double betatron electromagnet (Fig. 3, curve 15). At time / 5, after the end of the energy input, the thyristor 7 is turned on to the excitation winding 4, the oscillatory discharge of the capacitive storage 5 to the excitation winding 4 begins (Fig. 3, curve 14), under the action of the voltage of the capacitive storage 5, the thyristor 12 is de-energized and turned off. In the second double-betatron electromagnet, magnetic fluxes are created through the reverse magnetic circuit of the magnetic circuit 3 of the second electromagnet, in the equilibrium orbit, and the central magnetic flux. At time f, after the end of the acceleration process y2, a decreasing part of the current pulse is formed in the excitation winding 4 (Fig. 3, curve 15). By the time t, the current in the field winding 4 becomes equal to zero, and the capacitive storage 5 is recharged to the maximum voltage with the polarity indicated without brackets. In this case, all the energy stored in the magnetic field of the second double betatron electromagnet is recuperated into the capacitive storage 5 during the time interval and the cycle of operation of the pulse double betatron power supply system has ended.

Thus, in the considered pulse power supply system of a double betatron instead of 8 thyristors of two oscillatory circuits, only 2 are used, one capacitive storage is used instead of two, which, accordingly, leads to a significant reduction in the cost and weight and size parameters of a double betatron. At the same time, to ensure energy input into the field windings of the first and second electromagnets of a double betatron, instead of two energy input circuits, one is used, which consists of a power supply 8, a reactor 9 and thyristors 10 ... 12, which also leads to a decrease in cost and overall dimensions double betatron.

Claims (1)

A double betatron pulse power system comprising a first electromagnet with a magnetic circuit and with an excitation winding, a second electromagnet with a magnetic circuit and with an excitation winding, a capacitive storage device, characterized in that the excitation winding of the first electromagnet is connected through one thyristor to a capacitive storage device, which is connected to the thyristor via another thyristor the excitation winding of the second electromagnet, and in parallel to the excitation winding of the first electromagnet through the first and second thyristors of energy input connected s connected in series between a DC power supply and a choke, through which a third power input thyristor connected in parallel to the excitation winding of the second electromagnet.